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TELEPHONE. No. 855,687... PatentedJan. 11, 1887.

WLM/meow h uw D hm I ing the same.

CHARLES E. EGAN, OF COLUMBUS,

NITED STATES onio, Assrenon on ONE-HALF To W. Y. MILES, SAME PLACE.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 355,687, dated J' anuary 11,1887. y,

Application filed April 6, 1,886. Serial No. 197,966. (No model.)

To all whom t may concern:

Be it known that I, CHARLES E. Ecran, of

Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Electric Telephones; and I do hereby declare that the'following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the lettersl of reference marked thereon, which form part of this specification.

My invention relates to magneto-electric telephones in which the receiving and transmitting apertures are placed upon opposite sides ofthe vibrating plate; and it consistsin the combinations and arrangements of parts hereinafter set forth, and particularly pointed out in the claims. l

Referring to the accompanying drawings in this specification, Figure l is a section of my telephone, showing also the speaking-tube and' transmitting-box. Fig. 2 is a section of the transmitting-diaphragm and its accompanying parts. Fig. 3 is an end view of the tubular magnet. Fig. 4 is a cross-section of the speaking-tube. f L

The same letters refer to similar parts in all the g'ures.

A is a handle, of wood or other suitable material, having a cavity, a, in one end and another cavity, a', in the other end, as shown, and a central cylindrical passage-Way connectrlhis central passage-way is screw-threaded to receive the threaded tubular magnet B. The magnet projects into the cavity a', and is there surrounded by a coil of insulated Wire, C. The other end ofthe mag' net-bar has a notch, b, for the-reception of a screw-driver when it is desired to adjust the position of the magnet in handle A. The ends of the coil C connect with contact-pieces c c in the end of block A.

Acap, A', is screwed upon that end of handle A which contains the cavity a', and clamps the edge of the diaphragm D between itself and the block and adjacent to the magnet B and coil C. At the center of cap A is an opening, from Which a iiexible tube, E, preferably of rubber, leads to the transmitter-box F. On the inner face of cap A are contact-pieces, which register with c and c when the cap is screwed on. From these contact-pieces run the wires e e', the former being wound spirally on the outside of tube E, and the latter'being similarly disposed on the inside of said tube. Outside of the whole is a covering, E', preferably of braided material, similar to the covering of flexible gas-conveying tubes for droplights.

rIhe wires ve e' enter the transmitter-box F and connect therewith the line,'as usual. 'Ihe tube E opens into a cup, G, the rim of which is secured to Ethe innerside of the front of box F. Inside 0f, the cup is a secondary diaphragm, H, also secured to the front of box F, around its circumference, so that itis free to vibrate. Opposite itscenter an opening, f, 4is made in box F,which may be provided with mouth-piecef.

Upon speaking into the mouth-piece f the vibrations of the secondary4 transmitter-diaphragm H are communicated 1to the body of air confined in the cup G, the tube E, and the space between the cap A and diaphragm D, thereby setting the latter in vibration and exciting a current in the coil C and the wires ee', in the usual way. When a message is received, the cavity a serves'- as an ear -trumpet, the sound-Waves produced by the vibration of diaphragm D being conveyed to the ear through the tubular magnet B. v

It is obvious that this forms a convenient and simple telephone apparatus, the same instru ment being used as receiver and transmitter, but without the unpleasant necessity of removing it from the ear when it is desired to transmit.

What I claim, and desire ters Patent, is-

1. The combination of the transmitter F, having the diaphragms H and air-cup G, and the iiexible tube E, having electrical conductors externally and internally wound thereon,

to secure by Let'- and forming part of the line-circuit, with the on the flexible tube, substantially as herein set In testimony that I claim the foregoing aS forth. i my own I aix my signature in presence of 4 2.`The combination, with the handle A, two Witnesses. having cavities a a', the tubular magnet B, the CHARLES E. EGAN.

5 coil C, the contact-pieces c c', cap A', and the Vitnessesz' diaphragm D, of the tube carrying wires e e', O. E. DUFFY,

the cup G, and the diaphragm H, as set forth. S. BRASHEARS. 

